大型沉管隧道模型试验相似材料研究  

Research on Similar Materials for a Large Immersed Tunnel Model Test

作　　者：胡指南[1] 谢永利[1] 来弘鹏[1] 

机构地区：[1]长安大学公路学院,西安710064

出　　处：《现代隧道技术》2015年第1期114-118,共5页Modern Tunnelling Technology

基　　金：国家科技支撑计划项目(2011BAG07B01);中央高校基金项目(CHD2012TD009)

摘　　要：为研究沉管隧道在不均匀沉降及不均匀荷载作用下的节段接头作用机理,参考试验平台尺寸确定了试验模型相似比,根据相似定理推导了相似判据。采用高水灰比、高砂率并选取低标号水泥、低弹模骨料、膨润土、聚丙烯纤维、粉煤灰等材料制成相似材料混合料,经试配试验最后确定相似材料混合料配合比。应用万能压力机、应变仪、引伸计等对试件强度与弹性模量进行了力学测试。配合比试验研究表明,通过调节膨润土的掺量,能够配制出弹模低于10 GPa,而强度高于8 MPa的相似材料混凝土。所配制的相似材料混凝土的力学性能稳定,与普通混凝土的力学性质相似,满足试验要求。To research the mechanism of the segment joint of an immersed tunnel under uneven settlement and load, the similarity ratio of a relevant model test was determined regarding the dimension of the test platform, and the similarity criteria was deduced based on the similarity theorem. Regarding the similar material selection, a low-grade cement with a high water-cement ratio and sand ratio, an aggregate with a low elastic modulus, bentonite, polypropylene fiber, and fly ash were adopted to prepare a strong mixture with a low elastic modulus, whose mix ratio was determined via a test. Furthermore, a mechanical test was carried out with a universal press machine, strain gauge, and extensometer for the specimen＇s strength and elastic modulus. According to the mix ratio test, a similar concrete material with an elastic modulus less than 10 GPa and strength greater than 8 MPa can be produced by adjusting the content of bentonite, whose mechanical behavior is as stable as that of the normal concrete.

关 键 词：相似材料 沉管隧道 模型试验 

分 类 号：U459.5[建筑科学—桥梁与隧道工程]